Service Campaign Bulletin Service Campaign Bulletin

FILE: SERVICE: GROUP 00 OF SERVICE INFORMATION BINDERPARTS: GROUP I OF INFORMATION - PARTS & ACCESSORIES BINDER

Campaign No. 96-1121

December 1996

TO: OUR MERCEDES-BENZ PASSENGER CAR DEALERS

SUBJECT: MODELS WITH DIESEL ENGINES EQUIPPED WITH TRAP OXIDIZERSREPLACEMENT OF THE TRAP OXIDIZER WITH AN OXIDATION CATALYST

Enclosed is a sample copy of a letter which will be mailed in the near future to all owners of vehicleslisted below. In the event it becomes necessary to replace the trap oxidizer on a vehicle listed below, itmust be replaced with an oxidation catalyst as described in the attached Work Instructions 359 Group14.

Affected ModelsModel Year

1985

1986

1987

Models

123.133/153/193 1)

126.120 1)

126.125 1)

124.133/193

126.125California version

Order No. S-SC-96-1121This bulletin has been created and maintained in accordance with MBNA-SLP 5.1, Document and Data Control, andMBNA-SLP 16.1, Control of Quality Records.

Mercedes-Benz

Mercedes-Benzof North America, Inc.

December 1996Dear Mercedes-Benz Owner:

Several years ago, we sent you or the previous owner of record a letter, advising you about our "trapoxidizer" exchange or extended warranty policy.

Basically, for owners of certain 1985 Model Year cars it specified a 30,000 mile exchange interval, andfor owners of certain 1986 and 1987 Model Year cars it extended our warranty indefinitely.

We are happy to inform you that we now have a replacement device with sufficient durability, thereforereplacements of the trap oxidizer will no longer be necessary. The replacement device, known as:"oxidation catalyst", is standard equipment on our newest Diesel models.

Please continue driving your car as usual, i.e. until you reach the mileage at which your next trapoxidizer replacement would be due, or until you schedule your next regular service. At that time, makean appointment with your local authorized Mercedes-Benz dealer, and instead of replacing the trapoxidizer, an oxidation catalyst will be installed. Subsequent periodic exchanges of the oxidation catalystwill not be necessary. Please remember that failure to have the trap oxidizer replaced as required couldcause substantial engine damage. Thus, it is very important to bring in your vehicle on therecommended exchange interval or your next scheduled service to have an oxidation catalyst installed.

This technical upgrade will be performed for you free of charge.

The oxidation catalyst is covered by the Limited Service Parts and Accessory Limited Warranty for 12months unlimited mileage. For further details regarding this warranty, please contact your authorizedMercedes-Benz dealer.

We wish you continued safe driving.

Sincerely,

Harold D. WhitefordVice President Operations

Address:One Mercedes Drive, P.O. Box 350 Telephone: (201) 573-0600 Cable: Overseas Telex 135404Montvale, NJ 07645-0350 Telefax: (201) 573-0117 Mercebenz Mtle Domestic Telex 135404

Mercedes-Benz - Registered trademarks of Mercedes-Benz AG, Stuttgart, Federal Republic of Germany

Mercedes-Benz Service

Group: 14

Date: December 1996 Number: 359

SUBJECT: MODELS WITH DIESEL ENGINES EQUIPPED WITH TRAP OXIDIZERSREPLACEMENT OF THE TRAP OXIDIZER WITH AN OXIDATION CATALYST

The procedure for removal of the trap oxidizer and installation of an oxidation catalyst is divided into thefollowing steps:A. Models 123.133/153/193, engine 617.952 and

Model 126.120, engine 617.951B. Models 124.133/193, engine 603.960C. Model 126.125, engine 603.961

Procedure:

A. Models 123.133/153/193, engine 617.952 andModel 126.120, engine 617.951

1. Remove trap oxidizer (refer to SMS 14-480 [trap oxidizer is referred to in SMS 14-480, as sootcombustion filter]).

2. Install oxidation catalyst in place of trap oxidizer (install oxidation catalyst using same proceduredescribed in SMS 14-480, under installation of trap oxidizer).

B. Models 124.133/193, engine 603.960

1. Remove trap oxidizer (SMS 14-0100).2. Install trap oxidizer replacement pipe in place of trap oxidizer (install trap oxidizer replacement pipe

using same procedure described in SMS 14-0100, under installation of trap oxidizer).3. Remove entire exhaust system (SMS 49-7000, subject B [subheading a: Without oxidation

catalyst]).4. Install oxidation catalyst and front pipe assembly in place of front pipe (SMS 49-7000, subject B

[subheading b: With oxidation catalyst]).5. Install new resonator and new rear muffler then connect to oxidation catalyst (SMS 49-7000, subject

B [subheading b: With oxidation catalyst]).

C. Model 126.125 engine 603.961

1. Remove trap oxidizer (SMS 14-0100).

This bulletin has been created and maintained in accordance with MBNA-SLP 5.1, Document and Data Control, andMBNA-SLP 16.1, Control of Quality Records.

© 1996 Mercedes-Benz of North America, Inc. All rights reserved. Reproduction or translation in whole

Mercedes-Benz Canada, Inc. or in part is not permitted without authorization from theTechnical Information • publisher. Printed in U.S.A.

Work Instructions

2. Install trap oxidizer replacement pipe in place of trap oxidizer (install trap oxidizer replacement pipeusing same procedure described in SMS 14-0100, under installation of trap oxidizer).

3. Remove front exhaust pipe (SMS 49-7000 subject C).4. Install oxidation catalyst and front pipe assembly in place of front pipe, connect to resonator.

Note:Inspection of the turbocharger as described in SMS 14-480 (engine 617.95) must be performed for allvehicles mentioned in procedures A - C. If replacement of the turbocharger is necessary (due todamage caused by the trap oxidizer), replacement of the turbocharger will be covered under warranty.

Parts Information (Model 123.133/153/193, engine 617.952 and model 126.120. engine 617.951)Part Name Part NumberOxidation catalyst 126 490 34 14

Parts Information (Model 124.133, engine 603.960)Part Name Part Number

Oxidation catalyst/front exhaust pipe assembly 124 490 00 47

Trap oxidizer replacement pipe 603 140 03 03 1)

Center exhaust pipe/resonator 124 490 86 21 D

Rear exhaust pipe/muffler 124490 13 15

Parts Information (Model 124.193, engine 603.960)Part Name Part NumberOxidation catalyst/front exhaust pipe assembly 124 490 00 47

Trap oxidizer replacement pipe 603 140 03 03 1)

Center exhaust pipe/resonator 124 490 86 21 D

Rear exhaust pipe/muffler 124490 1921

Parts Information (Model 126.125, engine 603.961)Part Name Part Number

Oxidation catalyst/front exhaust pipe assembly 126490 1320D

Trap oxidizer replacement pipe 603 140 03 03 D

1) Parts requirments have to be faxed to your respective PDC with chassis number, as the parts will be blocked from systemreordering.

W.I. 359, Grp. 14

In Case of Warranty

Operation: Refer to table below.

Damage Code

14 355 53

Repair Code

1 1 (refer to Procedure A)

1 1 (refer to Procedure B)

1 1 (refer to Procedure B)

1 1 (refer to Procedure C)

10 (inspect turbocharger)

Time (hrs.)

2.2

1.0

1.5

1.0

0.3

Model Indicator(s)

35/36/37/56

81/87

57

35/36/37/56/57/81/87

Note: The oxidation catalyst is covered by a 12 month/unlimited mileage, Limited Service Parts and Accessory warranty.For oxidation catalyst damage codes to be used, refer to the latest damage code microfiche.

W.I.359, Grp. 14